JP2018086117A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which is excellent in shape retention of an absorbent core when worn, and is excellent and stable in excretion absorption performance and wear feeling.SOLUTION: An absorbent article 1 includes: a liquid retentive absorbent core 40; and a skin side core wrap sheet 41 covering a skin facing surface of the absorbent core 40. To the skin facing surface of the absorbent core 40, adhesive 9 is attached; to the adhesive attached surface, the skin side core wrap sheet 41 is bonded via the adhesive 9. With respect to adhesion area rate of the adhesive 9 on the adhesive attached surface of the absorbent core 40, a magnitude relationship is established where a core lateral direction end parts 40S positioned on both ends in the lateral direction Y of the absorbent core 40 becomes large in comparison with a core lateral direction center part 40M between the core lateral direction both end parts 40S, 40S.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an absorbent article including an absorbent core and a sheet covering the absorbent core.

  As absorbent articles such as disposable diapers, a liquid-permeable surface sheet that forms a skin-facing surface, a liquid-impermeable back sheet that forms a non-skin-facing surface, and an absorbent body disposed between these two sheets are provided. The absorbent body is known to be composed of an absorbent core containing an absorbent material such as wood pulp or a water-absorbing polymer, and a core wrap sheet covering the outer surface of the absorbent core. The core wrap sheet serves as a sheet for receiving the absorbent material during the production of the absorbent body, and plays a role of wrapping the absorbent core and shaping it after the production. Conventionally, water-permeable sheets such as thin paper, absorbent paper, and nonwoven fabric are used as the core wrap sheet. The absorbent core and the core wrap sheet are usually joined to each other via an adhesive.

  Conventionally, there exists a problem that the shape of an absorptive core collapses at the time of wear of an absorptive article. When wearing an absorbent article in a state where the shape of the absorbent core has collapsed, there is a possibility that the site corresponding to the crotch part of the wearer in the absorbent article is irregularly deformed and hinders the wearer's walking, Moreover, there is a possibility of causing excrement leakage such as urine and a decrease in wearing feeling. As a technique capable of suppressing such a shape collapse of the absorbent core, a through hole is formed in the absorbent core, and the core wrap sheet on each of the skin facing surface side and the non-skin facing surface side of the absorbent core is penetrated between the core wrap sheets. There is known a technique of joining each other through holes, but such a technique has a problem in that the absorption capacity of the absorbent core is reduced due to a decrease in the absorbent material accompanying the formation of the through holes. In addition, as another technique that can suppress the collapse of the shape of the absorbent core, a technique for embossing the absorbent core is known, but such a technique causes the absorbent core to harden and decreases the feeling of wearing, etc. May cause new problems.

  In Patent Document 1, as an absorbent article capable of effectively suppressing the shape collapse of the absorbent core, an adhesive for bonding a core wrap sheet is provided on each skin facing surface and non-skin facing surface of the absorbent core. A linear adhesive adhering portion extending in a direction (a direction corresponding to a wearer's front-rear direction) is intermittently arranged in a horizontal direction (a direction perpendicular to the vertical direction) to form a stripe pattern, The center line extending in the vertical direction by dividing each adhesive adhering portion into two in the horizontal direction does not overlap the skin facing surface and the non-skin facing surface of the absorbent core, and the skin facing surface of the absorbent core is more An absorbent article is described in which the number of adhesive adhering portions is smaller than that of the non-skin facing surface.

  Patent Document 2 describes that the skin facing surface of the absorbent core is made lower than the non-skin facing surface with respect to the coating area ratio of the adhesive for joining the core wrap sheet. According to Patent Document 2, with such a configuration, the degree of swelling when the absorbent core absorbs excrement becomes larger on the skin facing surface side than on the non-skin facing surface side, so that the wearer's skin It is said that there is a gap between the surface sheet and the surface sheet, and air permeability can be improved. In Patent Documents 1 and 2, the number of adhering portions of the adhesive for bonding the core wrap sheet or the coating area ratio are different from each other between the skin facing surface and the non-skin facing surface of the absorbent core. Yes, they are uniform on the skin facing surface or the non-skin facing surface of the absorbent core.

  In Patent Literature 3, an absorbent article having an absorbent core having a constricted portion at the crotch and a core wrap sheet covering the absorbent core is defined by a core wrap sheet at a position where the constricted portion is formed. A space portion is formed, and an absorbent core and a core wrap sheet that define the space portion are not coated with an adhesive for joining the core wrap sheet. According to the absorbent article described in Patent Document 3, since the space functions as a bulge allowance when the absorbent core absorbs excrement and swells, swelling of the absorbent core due to liquid absorption is a core wrap sheet. It is said that the inconvenience that is hindered by this can be avoided and the leak-proof property can be improved.

JP 2014-100307 A JP 2013-255560 A JP 2013-99451 A

  The collapse of the shape of the absorbent core when the absorbent article is worn is more likely to occur at both lateral ends than in the lateral center of the absorbent core. The reason for this is that both ends of the absorbent core in the lateral direction are particularly susceptible to pressure by the wearer's thighs when the absorbent article is worn. This is because the stress is large and the stress caused by friction with the wearer's skin is easily applied. Further, in the absorbent core, the excrement is usually absorbed directly in the lateral center of the crotch, and the absorbed excretion diffuses in the surface direction. There is a difference in rigidity due to the difference in the amount of excreta absorbed between the two parts, and the boundary between the two parts and the vicinity thereof become a rigidity change part (absorbent core Dry-Wet interface). The occurrence of the change is also one of the causes that the lateral end portions of the absorbent core are particularly liable to collapse. A technique that can effectively prevent the shape collapse of both ends of the absorbent core in the lateral direction has not yet been provided.

  Therefore, the subject of this invention is related to providing the absorbent article which is excellent in the shape retention property of the absorptive core at the time of wear, and the excretion absorption property and the feeling of wear are favorable and stable.

  The present invention has a longitudinal direction extending from the wearer's abdominal side to the back side through the crotch part and a transverse direction perpendicular thereto, a liquid-retaining absorbent core, and a core covering the absorbent core An absorbent article comprising a wrap sheet, wherein an adhesive is attached to at least one of a skin-facing surface and a non-skin-facing surface of the absorbent core, and the core is disposed on the adhesive-attached surface via the adhesive. A wrap sheet is joined, and the adhesive area ratio of the adhesive on the adhesive-attached surface of the absorbent core is related to the adhesive at the core lateral ends located at both lateral ends of the absorbent core. The absorbent article has a size relationship in which the adhesion area ratio is larger than the adhesion area ratio of the adhesive in the center portion in the core lateral direction sandwiched between both ends in the core lateral direction.

  ADVANTAGE OF THE INVENTION According to this invention, the absorbent article which is excellent in the shape retention property of the absorptive core at the time of wear, the shape of an absorptive core is hard to break down, and the excretion absorption performance and the feeling of wear are favorable and stable is provided. The

FIG. 1 is a plan view schematically showing a skin facing surface, that is, a surface sheet side of an unfoldable disposable diaper that is an embodiment of the absorbent article of the present invention. The elastic member of each part is stretched and expanded in a planar shape. FIG. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 3 is an explanatory view of an adhesion portion of the adhesive for joining the core wrap sheet in the diaper shown in FIG. 1, and schematically shows a main part on the skin facing surface side (surface sheet 2 side) of the expanded and expanded diaper 1. FIG.

  Hereinafter, an absorptive article of the present invention is explained with reference to drawings based on an example of a deployment type disposable diaper which is the preferred embodiment. 1 and 2 show a deployable disposable diaper 1 of the present embodiment. The diaper 1 has a longitudinal direction X extending from the wearer's stomach side to the back side through the crotch part and a lateral direction Y orthogonal thereto, and the stomach side part A and the back arranged on the stomach side of the wearer. A back side portion C disposed on the side and a crotch portion B positioned therebetween. The abdominal part A, the crotch part B, and the dorsal part C correspond to the respective regions when the diaper 1 is divided into three equal parts in the vertical direction X. The crotch part B has an excretion part facing part that is disposed to face the excretion part of the wearer's penis, anus, etc. when the diaper 1 is worn, and the excretion part facing part is usually in the longitudinal direction X of the diaper 1. Located at or near the center.

  As shown in FIGS. 1 and 2, the diaper 1 is disposed on the skin facing surface side of the absorbent body 4 having the absorbent core 40 and the absorbent body 4, and is located closer to the wearer's skin than the absorbent body 4. The liquid-permeable surface sheet 2 that can come into contact with the wearer's skin when worn and the non-skin-facing surface side of the absorbent body 4 is located farther from the wearer's skin than the absorbent body 4. Comprising a permeable or water-repellent back sheet 3, and in a plan view as shown in FIG. 1, the central portion of the longitudinal direction X located in the crotch B is constricted inward and long in one direction, that is, the longitudinal direction X. It has a vertically long hourglass shape. The top sheet 2 and the back sheet 3 have dimensions larger than the absorbent body 4 interposed between the sheets 2 and 3, respectively, and form the outer shape of the unfolded and stretched diaper 1 as shown in FIG. ing.

  In the present specification, the “skin facing surface” refers to a surface of the absorbent article or a component thereof (for example, the absorbent core 40) that is directed toward the wearer's skin when the absorbent article is worn, that is, relatively. It is the side close to the skin of the wearer, and the “non-skin facing surface” is the surface of the absorbent article or its constituent members that is directed to the side opposite to the skin side (clothing side) when the absorbent article is worn, that is, relative It is the side far from the wearer's skin. In addition, "at the time of wearing" here means the state in which the normal proper wearing position is maintained, and does not include the case where the absorbent article is in a state of being deviated from the proper wearing position.

  In the diaper 1, as shown in FIG.1 and FIG.2, between the surface sheet 2 and the absorber 4 (skin-side core wrap sheet | seat 41), it is called a second sheet | seat etc. in this technical field. Layer 5 is arranged. The sublayer 5 and the surface sheet 2 constitute a “surface layer arranged closer to the wearer's skin than the absorbent body 4”. Sheet 2. The sublayer 5 covers substantially the entire skin facing surface of the absorbent body 4.

The sublayer 5 plays a role of improving the permeability of the liquid from the top sheet 2 to the absorber 4, reducing the liquid return of the liquid absorbed by the absorber 4 to the top sheet 2, and the absorbent core 40. It can also contribute to the suppression of shape collapse. This is because the rigidity of the absorber 4 as a whole is improved by the presence of the sublayer 5. From the viewpoint of ensuring the effect of the sublayer 5 as described above, the basis weight of the sublayer 5 is preferably 15 g / m ² , more preferably 20 g / m ² or more, and preferably 60 g. / M ² or less, more preferably 50 g / m ² or less. The sublayer 5 may be a hydrophilic and liquid-permeable sheet, and examples thereof include paper, woven fabric, and non-woven fabric. However, the non-woven fabric is particularly preferable because it has relatively high strength and excellent flexibility. Examples of the nonwoven fabric forming the sublayer 5 include an air-through nonwoven fabric, a point bond nonwoven fabric, a resin bond nonwoven fabric, a spunlace nonwoven fabric, and an airlaid nonwoven fabric.

  Between the top sheet 2 and the back sheet 3 at the waist portions of the ventral side portion A and the back side portion C, that is, at the end portion in the longitudinal direction X, the thread-like elastic member 11 is stretched along the lateral direction Y. The waist gathers are formed by the contraction of the elastic member 11 at the waist when the diaper 1 is worn. Moreover, the side seat | sheet 6 is distribute | arranged to the right-and-left both sides along the vertical direction X in the surface sheet 2 side of the diaper 1, respectively. The side seat 6 has an inner edge along the vertical direction X and an outer edge along the vertical direction X that is located outward in the lateral direction Y from the inner edge, and is a flat surface as shown in FIG. In view, the inner edge overlaps the absorbent body 4, and the outer edge extends from the side edge along the longitudinal direction X of the absorbent body 4 outward in the lateral direction Y and is joined to the back sheet 3. Between the side sheet 6 and the back sheet 3 in the left and right leg portions arranged around the legs of the wearer, a thread-like elastic member 12 is fixed in an extended state along the vertical direction X. A pair of leg gathers is formed in the leg part when the diaper 1 is worn by contraction of the elastic member 12. In addition, a thread-like elastic member 13 is fixed to the inner edge of the side seat 6 in a stretched state along the longitudinal direction X, so that when the diaper 1 is worn, at least the crotch B The side sheet 6 stands up toward the wearer's skin starting from the joint with the other member, and a leak-proof cuff is formed. The top sheet 2, the back sheet 3, the absorber 4, the side sheet 6, and the elastic members 11 to 13 are joined to each other by a known joining means such as a hot-melt adhesive.

  As shown in FIG. 1, a pair of fastening tapes 7 and 7 are provided on both side edges along the longitudinal direction X of the back side C of the diaper 1. A fastening part 71 made of a male member of a mechanical surface fastener is attached to the fastening tape 7. In addition, a non-skin facing surface of the ventral side portion A of the diaper 1 is formed with an attachment region 8 made of a female member of a mechanical surface fastener. The to-be-attached region 8 is formed by attaching a female member of a mechanical hook-and-loop fastener to the non-skin facing surface of the back sheet 3 that forms the non-skin facing surface of the ventral side A by a known joining means such as an adhesive or heat seal. The fastening portion 71 of the fastening tape 7 is detachably fastened so as to be detachable.

As the top sheet 2, it is possible to use various types of conventionally used absorbent articles such as disposable diapers without any particular limitation, and it is assumed that the top sheet 2 is a liquid-permeable sheet that can permeate body fluids such as urine and feces. As a woven fabric, a nonwoven fabric, a porous sheet, etc. which consist of synthetic fiber or a natural fiber, it can be used. As an example of the surface sheet 2, a non-woven fabric made of natural fibers such as cotton or a non-woven fabric made of various synthetic fibers subjected to hydrophilic treatment can be used. For example, a core-sheath structure type (including side-by-side type) composite fiber using polypropylene or polyester as the core component and polyethylene as the sheath component is made into a web by carding, and then nonwoven fabric (after this is opened at a predetermined location) by the air-through method That may be treated). From the viewpoint of high liquid permeability (dry feeling), an apertured sheet made of polyolefin such as low density polyethylene can also be preferably used.
As the back sheet 3, various materials conventionally used for absorbent articles such as disposable diapers can be used without particular limitation, and liquid-impermeable (including water repellency) and moisture-permeable materials are preferable. Used. Specifically, in order to obtain sufficient water vapor permeability, a porous film having a fine hole formed by stretching a film made of a synthetic resin such as polyethylene in which fine powder made of a filler such as calcium carbonate is dispersed is a back sheet. 3 can be suitably used.
As the side sheet 6, what can be used as the back sheet 3 can be used.

  The absorbent body 4 includes a liquid-retaining absorbent core 40, a skin-side core wrap sheet 41 that covers the skin-facing surface of the absorbent core 40, and a non-skin-side core that covers the non-skin-facing surface of the absorbent core 40. A wrap sheet 42 is included. The absorbent body 4 (absorbent core 40) is in the shape of an hourglass in which the central portion of the longitudinal direction X located in the crotch portion B is inwardly bounded in a plan view as shown in FIG. have.

  The absorbent core 40 is mainly composed of an absorbent material, and the content of the absorbent material in the absorbent core 40 is usually about 100% by mass. As an absorptive material, various things conventionally used for absorbent articles, such as a disposable diaper, can be used without a restriction | limiting especially, For example, hydrophilic fibers, such as synthetic fiber processed with wood pulp and a hydrophilizing agent And water-absorbing polymer particles. Examples of the structure of the absorbent core 40 include a structure in which a hydrophilic fiber stack, a structure in which water-absorbing polymer particles are supported on the stack, or a structure composed only of water-absorbing polymer particles.

In this embodiment, as shown in FIG. 2, the skin side core wrap sheet 41 and the non-skin side core wrap sheet 42 constitute one continuous core wrap sheet. More specifically, in the present embodiment, one continuous core wrap sheet having a width of 2 to 3 times the length of the absorbent core 40 in the lateral direction Y is employed. As shown in FIG. 2, the core wrap sheet covers the entire skin facing surface of the absorbent core 40 and extends outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent core 40. The extended portion is wound down below the absorbent core 40 to cover the entire area of the non-skin facing surface of the absorbent core 40. And in this one core wrap sheet, the portion covering the skin facing surface of the absorbent core 40 is the skin side core wrap sheet 41, and the portion covering the non-skin facing surface of the absorbent core 40 is the non-skin side core wrap. This is a sheet 42. In the present embodiment, the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42 are the same as the sheet. The basis weight of the core wrap sheets 41 and 42 is preferably 5 g / m ² or more, more preferably 10 g / m ² or more, and preferably 40 g / m ² or less, more preferably 30 g / m ² or less.

  In the present embodiment, as shown in FIG. 2, the adhesive 9 is attached to both the skin facing surface and the non-skin facing surface of the absorbent core 40, and the absorptivity is one of these adhesive attaching surfaces. The skin-side core wrap sheet 41 is bonded to the skin facing surface of the core 40 via the adhesive 9, and the adhesive 9 is bonded to the non-skin facing surface of the absorbent core 40, which is another one of these adhesive-attached surfaces. The non-skin-side core wrap sheet 42 is joined via. In each of the skin facing surface and the non-skin facing surface of the absorbent core 40, the adhesive 9 does not adhere to the entire area of the surface without any gap (so-called solid coating), and the adhesive 9 does not adhere to the adhesive portion. It adheres intermittently in a pattern that includes adhering parts. The shape of the adhesive 9 in plan view (coating pattern of the adhesive 9) is not particularly limited, and examples thereof include a linear or spiral shape extending in the vertical direction X, and a long Ω (omega) shape in the vertical direction X. . As the adhesive 9, what is usually used for joining members in this type of absorbent article, such as a hot-melt adhesive, can be used without particular limitation.

  FIG. 3 shows a main part on the skin facing surface side (surface sheet 2 side) of the diaper 1 in a developed and extended state as a diagram for explaining an adhesion portion of the adhesive 9. As one of the main features of the diaper 1, the adhesion surface of the adhesive 9 on the absorbent core 40, specifically, the adhesion area of the adhesive 9 on at least one of the skin facing surface and the non-skin facing surface of the absorbent core 40. With respect to the rate, the core lateral end 40S located at both ends in the lateral direction Y of the absorbent core 40 is larger than the core lateral center 40M sandwiched between the core lateral ends 40S, 40S. (Adhesion area ratio of the adhesive 9 at the core lateral direction end portion 40S> Adhesion area ratio of the adhesive 9 at the core lateral direction central portion 40M), there is a point that a magnitude relationship is established. The adhesion area ratio of the adhesive is measured by the following method.

<Measurement method of adhesion area ratio of adhesive>
A colored toner such as black (trade name “Refill toner powder bottle for laser printer 560971” manufactured by Brother Industries, Ltd.) is sprayed on the adhesive adhesion surface of the measurement target (core wrap sheet), and the adhesive adhesion surface is dispersed. The adhering adhesive is colored, and the colored measurement object is cut into a predetermined size to obtain a measurement sample. And the total area of the coloring part (adhesive adhesion part) in the measurement sample is measured. The total area of the colored portion is measured by forming an image of the toner dispersion surface in the measurement sample by a known method, binarizing the image data, and performing the binarization based on the binarized data. The adhesion area ratio of the adhesive is calculated from the total area of the colored portions thus obtained by the following formula. For one measurement object, the adhesion area ratio of the adhesive is obtained by the above procedure at any three or more locations, and the average value thereof is taken as the adhesion area ratio of the adhesive in the measurement object.
Adhesive area ratio (%) = (total area of colored parts / area of measurement sample) × 100

  In the case where the constituent member (for example, core wrap sheet) is taken out from the absorbent article and evaluated and measured, when the constituent member is fixed to another constituent member by adhesive, fusion, etc., Remove the fixed part after removing it by applying solvent or blowing hot air with a dryer.

  As described above, the core lateral end portions 40S and 40S positioned at the both lateral ends of the absorbent core 40 are portions that are particularly susceptible to pressure by the wearer's thighs when the diaper 1 is worn. The shape collapse of the core 40 is more likely to occur at the core lateral end 40S than at the core lateral center 40M. On the other hand, the shape collapse of the absorptive core 40 is suppressed, so that there are many joining locations by the adhesive agent 9 with the core wrap sheets 41 and 42 which coat | cover this. Therefore, in the diaper 1, regarding the adhesion area ratio of the adhesive 9 that joins the absorbent core 40 and the core wrap sheets 41, 42, the adhesion surface of the adhesive 9 (the skin facing surface or non-skin of the absorbent core 40). In the facing surface), a relationship of “the adhesion area ratio of the adhesive 9 at the core lateral direction end portion 40S> the adhesion area ratio of the adhesive 9 at the core lateral direction center portion 40M” is established. As a result, the strength and shape retention of the core lateral end portions 40S and 40S are improved, so that relatively large strain and friction are applied to the core lateral end portions 40S and 40S due to movement of the wearer's legs when the diaper 1 is worn. Even if it takes, those shapes are maintained, As a result, the outstanding absorption performance and a feeling of wear can be expressed stably over a long time.

  Further, from the viewpoint of preventing the shape of the absorbent core 40 from being deformed, it is effective to increase the adhesion area ratio of the adhesive 9 not only in the core lateral ends 40S and 40S but also in the core lateral center 40M. Although it is thought that there exists, raising the adhesion area rate of the adhesive agent 9 of the core horizontal direction center part 40M may raise another problem. That is, when the diaper 1 is worn, it is desirable that the absorbent body 4 be flexibly deformed so as to conform to the outer shape of the wearer's crotch part. However, the adhesion area ratio of the adhesive 9 in the core lateral direction central part 40M is high. If too much, the flexibility and flexibility of the absorbent body 4 are significantly reduced, and it becomes difficult for the absorbent body 4 to be deformed along the body shape of the wearer. May be incurred. In consideration of such points, in the diaper 1, the adhesive area ratio of the adhesive 9 is selectively increased with respect to the core lateral end portions 40S and 40S, which are portions where the shape collapse is particularly likely to occur in the absorbent core 40. In addition, the adhesion area ratio of the adhesive 9 in the central portion 40M in the core lateral direction, which is a region sandwiched between them, is not increased.

  Specifically, the core lateral center portion 40M and the core lateral end portion 40S are respectively defined as follows. That is, referring to FIG. 3, in the absorbent core 40, the width Y in the lateral direction Y from each of the laterally opposite ends 431 and 431 of the narrowest core portion (constricted portion) 43 that is the smallest length or width in the lateral direction Y is shown. Two imaginary straight lines VL extending in the longitudinal direction X through a position spaced inward by a distance corresponding to 10% of the width of the narrowest core portion 43 (that is, the length between the lateral ends 431 and 431), A portion sandwiched between both virtual straight lines VL and VL in the absorbent core 40 with the VL as a boundary is a core lateral center portion 40M. The core horizontal center portion 40M has a strip shape (rectangular shape) extending in the vertical direction X in plan view as shown in FIG. Moreover, the part located in the outer side of the horizontal direction Y from both virtual straight lines VL and VL in the absorbent core 40 is the core horizontal direction end 40S.

  In order to improve the adhesion area ratio of the adhesive, it is necessary to increase the area of the adhesive adhesion portion in the adhesion target (the skin facing surface or the non-skin facing surface of the absorbent core or the core wrap sheet). Even if the amount of adhesive per adhesive adhering portion is relatively large, the adhesive area ratio of the adhesive is not improved if the total area (number) of the adhesive adhering portions is relatively small. As a specific method for establishing the magnitude relationship of the adhesion area ratio of the adhesive 9, for example, the number of adhesive 9 adhesion means (for example, a nozzle for discharging the adhesive) An example is a method of differentiating between 40M and the core lateral end 40S. In this case, the number of means for attaching the adhesive 9 may be relatively small in the number corresponding to the core horizontal direction center portion 40M and relatively large in the number corresponding to the core horizontal direction end portion 40S. Either one of the absorbent core and the core wrap sheet or both may be the target of direct adhesion of the adhesive. As a means for attaching the adhesive 9, a known means can be used without any particular limitation.

  For example, referring to FIG. 3, the skin-side core wrap sheet 41 is located on the non-skin facing surface (facing surface with the absorbent core 40) in the lateral direction Y outside the two virtual straight lines VL and VL. Adhesive 9 may be applied to the entire region. In that case, on the non-skin facing surface of the skin-side core wrap sheet 41, an extension extending outward in the lateral direction Y from the lateral end of the absorbent core 40 (such as the lateral end 431 of the core narrowest width portion 43). The adhesive 9 is also applied to the protruding portion 410, that is, the portion that does not directly contribute to the bonding with the absorbent core 40, but there is no particular problem. Rather, the deformed shape of the absorbent core 40 can be more effectively prevented by applying the adhesive 9 to the extending portion 410 of the skin-side core wrap sheet 41. That is, when the adhesive 9 is applied to the extending portion 410 of the skin-side core wrap sheet 41 located outside the transverse width Y of the narrowest core portion 43, the extending portion 410 faces the extending portion 410. Since the extension part (not shown) of the non-skin-side core wrap sheet 42 is joined to each other through the adhesive 9, the core of the non-skin side core wrap sheet 42 is moved by the movement of the wearer's legs when the diaper 1 is worn. Even if a relatively large strain or friction is applied to both lateral ends 431, 431 of the narrow portion 43, the shape of the core narrowest portion 43 and its vicinity is maintained, and as a result, excellent absorption performance and feeling of wearing are long. It can be expressed stably over time.

  Moreover, in the diaper 1, as shown in FIG. 3, the core narrowest width part 43 exists in the center part (portion located around a wearer's leg) of the longitudinal direction X of the absorptive core 40, that is, The absorptive core 40 has a sand shape in a plan view as shown in FIG. 3, and this reduces strain and friction applied to the narrowest core portion 43 and its vicinity due to the movement of the wearer's legs. Yes. Therefore, the shape collapse of the absorbent core 40 hardly occurs in the first place.

  That is, in order to more effectively prevent the shape of the absorbent core 40 from being deformed, the “core” is attached to the surface of the absorbent core 40 where the adhesive 9 is attached (the skin facing surface or the non-skin facing surface of the absorbent core 40). In addition to the fact that the size relationship of “adhesion area ratio of the adhesive 9 at the lateral end portion 40S> adhesion area ratio of the adhesive 9 at the core lateral center portion 40M” is established, the absorbent core 40 further includes the crotch B (The central portion of the absorbent core 40 in the longitudinal direction X) has a constricted portion (core narrowest portion 43) whose length in the lateral direction Y, that is, the width is shorter than that of the peripheral portion, and the lateral direction Y of the constricted portion It is preferable that the skin side core wrap sheet 41 and the non-skin side core wrap sheet 42 are joined to each other via the adhesive 9 at the outer position.

  Moreover, as mentioned above, the rigidity of the absorber 4 as a whole is improved by the presence of the sublayer 5, which may lead to the suppression of the shape collapse of the absorbent core 40. Therefore, in order to more effectively prevent the shape of the absorbent core 40 from being deformed, the “core” is attached to the surface of the absorbent core 40 where the adhesive 9 is attached (the skin facing surface or the non-skin facing surface of the absorbent core 40). In addition to the fact that the size relationship of “adhesion area ratio of the adhesive 9 at the lateral end portion 40S> adhesion area ratio of the adhesive 9 at the core lateral center portion 40M” is established, the topsheet 2 and the absorbent body 4 (skin A liquid-permeable sublayer 5 is preferably arranged between the side core wrap sheet 41).

  As described above, the effect by adopting the specific magnitude relationship of the adhesion area ratio of the adhesive 9 on the adhesive-attached surface of the absorbent core 40 (the skin-facing surface or the non-skin-facing surface of the absorbent core 40) is more reliably achieved. From the viewpoint of making the absorbent core 40 have a skin facing surface or a non-skin facing surface, the adhesion area ratio of the adhesive 9 at the core lateral end 40S and the adhesion area of the adhesive 9 at the core lateral center 40M The ratio with the rate is preferably 2 or more, more preferably 3 or more, as the former / the latter, assuming the former> the latter. On the other hand, although there is no restriction | limiting in particular about the upper limit of such a ratio, it is in the boundary position of the former (core horizontal direction edge part 40S) and the latter (core horizontal direction center part 40M) by the rapid rigidity change at the time of wearing of the diaper 1. From the viewpoint of reducing the risk of the absorbent core 40 being broken, assuming the former> the latter, the former / the latter is preferably 15 or less, more preferably 10 or less.

  In the adhesive adhesion surface of the absorbent core 40 (the skin facing surface or the non-skin facing surface of the absorbent core 40), the adhesion area ratio of the adhesive 9 at the core lateral end 40S is preferably 5% or more, and more preferably. Is 10% or more, and preferably 75% or less, more preferably 50% or less, and the adhesion area ratio of the adhesive 9 in the central portion 40M in the core transverse direction on the adhesive adhesion surface is preferably 2%. Above, more preferably 5% or more, and preferably 30% or less, more preferably 20% or less. The adhesion area ratio of the adhesive 9 in the core lateral direction central portion 40M is zero%, that is, the adhesive 9 is not adhered to the core lateral direction central portion 40M in the skin facing surface or the non-skin facing surface of the absorbent core 40. May be.

On the adhesive-attached surface of the absorbent core 40 (the skin-facing surface or the non-skin-facing surface of the absorbent core 40), the basis weight of the adhesive 9 at the core lateral end 40S is preferably 3 g / m ² or more. Preferably it is 5 g / m ² or more. On the other hand, although there is no restriction | limiting in particular about the upper limit of the basic weight of the adhesive agent 9 of the core horizontal direction edge part 40S, the core horizontal direction edge part 40S and the core horizontal direction center part 40M by the sudden rigidity change at the time of wearing of the diaper 1 From the viewpoint of reducing the risk of the absorbent core 40 being broken at the boundary position, it is preferably 30 g / m ² or less, more preferably 20 g / m ² or less.
The basis weight of the adhesive 9 in the core lateral direction center portion 40M on the adhesive-attached surface of the absorbent core 40 (the skin facing surface or the non-skin facing surface of the absorbent core 40) prevents the shape of the absorbent core 40 from being deformed. And 0.5 g / m ² or more, more preferably 1 g / m ² or more, and preferably 15 g / m from the viewpoint of the balance between the softness and flexibility of the absorbent core 40 (absorbent body 4). ² or less, more preferably 10 g / m ² or less.

  The magnitude relationship of “attachment area ratio of the adhesive 9 at the core lateral direction end 40S> adhesion area ratio of the adhesive 9 at the core lateral direction center 40M” is the skin facing surface and the non-skin facing of the absorbent core 40. It is sufficient that it is established on any one of the surfaces, but it is established at least on the skin-facing surface of the absorbent core 40 from the viewpoint of more surely exhibiting the operational effect by adopting such a magnitude relationship. It is more preferable that it is formed on both the skin facing surface and the non-skin facing surface of the absorbent core 40. When the size relationship is established on both the skin-facing surface and the non-skin-facing surface of the absorbent core 40, the adhesion pattern of the adhesive 9 may be the same or different on the skin-facing surface and the non-skin-facing surface. May be.

  From the same viewpoint, it is preferable that the adhesion area ratio of the adhesive 9 is uniform in the core lateral end portion 40S. “Adhesive adhesion area ratio is uniform” here means that the adhesion pattern of the adhesive 9 is the same at any two locations in the core lateral direction end 40S, and the two arbitrary locations are Each has a rectangular shape in plan view of 20 mm length and 20 mm width. When this condition is not satisfied, the adhesion area ratio of the adhesive is not uniform. In addition, in the adhesive adhesion surface (the skin facing surface or the non-skin facing surface of the absorbent core 40) of the absorbent core 40, one and the other of the core lateral end portions 40 </ b> S and 40 </ b> S are usually attached areas of the adhesive 9. The rate is the same, but it can be different.

  Referring to FIG. 3, a region extending from the ventral side longitudinal end 1FE of the diaper 1 by a distance corresponding to 2/3 of the total length of the diaper 1 in the longitudinal direction X is defined as a front region 1F and the rest of the diaper 1 When the rear region 1R is the region (the region corresponding to 1/3 of the total length of the diaper 1 in the longitudinal direction X), the adhesive adhering surface (absorbent property) of the absorbent core 40 The magnitude relationship “the adhesion area ratio of the adhesive 9 at the core lateral direction end 40S> the adhesion area ratio of the adhesive 9 at the core lateral direction center 40M” on the skin facing surface or the non-skin facing surface of the core 40 is It is preferable that it is established at least in the front region 1F. The reason is that the excretory part of the wearer such as a penis and anus is usually biased to the ventral side in the longitudinal direction X, so that the front region is more than the rear region 1R (dorsal portion C) when the diaper 1 is worn. This is because 1F (portion of the ventral side A and the crotch B near the abdominal side A) is easily wetted by excrement, and the shape of the absorbent core 40 is easily collapsed in the front region 1F. Further, regarding the movement of the wearer's leg, which is one of the causes of the shape collapse of the absorbent core 40, the range of motion of the leg is usually larger on the abdominal side than on the back side. The shape collapse of the absorbent core 40 is more likely to occur in the front region 1F than in the rear region 1R. From the above, it is preferable that the magnitude relationship regarding the adhesion area ratio of the adhesive 9 is established at least in the front region 1F. A more preferable form is a form in which the size relationship is established not only in the front region 1F but also in the entire region of the adhesive-attached surface of the absorbent core 40 (the skin facing surface or the non-skin facing surface of the absorbent core 40). is there.

  From the same viewpoint, referring to FIG. 3, the adhesion area ratio of the adhesive 9 on the adhesive-attached surface of the absorbent core 40 (the skin-facing surface or the non-skin-facing surface of the absorbent core 40) is the front region 1F. The core lateral end portions 40SF and 40SF, the core lateral end portions 40SR and 40SR of the rear region 1R, and the core lateral center portion 40M are preferably larger in this order. That is, the core lateral end 40SF of the front region 1F is the maximum, regardless of whether the front region 1F or the rear region 1R, the core lateral center 40M is the minimum, and the core lateral direction of the rear region 1R It is preferable that the end portion 40SR is between the two.

In the skin facing surface or non-skin facing surface of the absorbent core 40, the adhesion area ratio of the adhesive 9 at the core lateral end 40SF of the front region 1F and the adhesion area ratio of the adhesive 9 at the core lateral center 40M The ratio is preferably 2.5 or more, more preferably 3.5 or more, and preferably 15 or less, more preferably 10 or less, assuming the former> the latter as the former / the latter.
Further, on the skin facing surface or the non-skin facing surface of the absorbent core 40, the adhesion area ratio of the adhesive 9 at the core lateral end portion 40SR of the rear region 1R and the adhesion area of the adhesive 9 at the core lateral center portion 40M. The ratio to the rate is preferably 2 or more, more preferably 3 or more, and preferably 15 or less, more preferably 10 or less, as the former / the latter, assuming the former> the latter.

As mentioned above, although this invention was demonstrated based on the embodiment, this invention can be changed suitably, without being restrict | limited to the said embodiment.
For example, in the embodiment, the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42 constitute one continuous sheet, but both the sheets 41 and 42 are separate sheets. Also good. In that case, the length or width in the lateral direction Y may be the same or different between the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42. If the widths of the two sheets 41 and 42 are different, whichever is longer. For example, the skin-side core wrap sheet 41 has the same width as the maximum width of the skin-facing surface of the absorbent core 40, that is, has a size that can cover the entire skin-facing surface of the absorbent core 40. The skin-side core wrap sheet 42 can be made wider than the sheet 41. The wide non-skin side core wrap sheet 42 covers the entire area of the non-skin facing surface of the absorbent core 40 and extends outward in the width direction Y from both side edges along the longitudinal direction X of the absorbent core 40. The extending portion may be wound up on the skin-side core wrap sheet 41 disposed to face the skin-facing surface of the absorbent core 40 and cover both side edges along the longitudinal direction X of the sheet 41. .

Moreover, the groove | channel by which the surface sheet 2 and the absorber 4 are integrally consolidated may be formed in the skin opposing surface of the diaper 1 from a viewpoint of improvement of an absorptivity, leak-proof property, etc.
The present invention is not limited to the deployable disposable diaper as in the above embodiment, but widely includes articles used for absorbing body fluids (urine, loose stool, menstrual blood, sweat, etc.) discharged from the human body, Disposable diapers, sanitary napkins, sanitary shorts, and the like are also included.
All the parts of only the one embodiment described above can be used together as appropriate.

1 Unfoldable disposable diaper (absorbent article)
2 Top sheet 3 Back sheet 4 Absorber 40 Absorbent core 40M Core lateral center part 40S Core lateral end part 40SF Core lateral end part of front side area 40SR Core lateral direction end part of rear side area 41 Skin side core wrap sheet 42 Non-skin side core wrap sheet 43 Core narrowest width part 5 Sublayer 9 Adhesive A for core wrap sheet bonding Abdominal side part B Crotch part C Back side part F Front side area R Rear side area X Vertical direction Y Horizontal direction

Claims (6)

A longitudinal direction extending from the abdomen side of the wearer through the crotch part to the back side and a transverse direction perpendicular thereto, a liquid-retaining absorbent core, and a core wrap sheet covering the absorbent core An absorbent article comprising:
An adhesive is attached to at least one of the skin facing surface and the non-skin facing surface of the absorbent core, and the core wrap sheet is bonded to the adhesive attaching surface via the adhesive,
Regarding the adhesive area ratio of the adhesive on the adhesive adhesion surface of the absorbent core, the adhesive area ratio of the adhesive at the lateral end portions of the core located at both lateral ends of the absorbent core Absorbent article which is larger than the adhesion area ratio of the adhesive in the central portion in the transverse direction of the core sandwiched between both ends in the direction, and has a size relationship.   The absorbent article according to claim 1, wherein the magnitude relationship is established on both the skin facing surface and the non-skin facing surface of the absorbent core.   The absorptive article according to claim 1 or 2 whose adhesion area rate of said adhesive in said core transverse direction end is more than twice the adhesion area rate of said adhesive in said core transverse direction central part.   The absorbent article according to any one of claims 1 to 3, wherein an adhesion area ratio of the adhesive is uniform at an end portion in the core lateral direction.   In the absorbent article, an area extending from the ventral longitudinal end by a distance corresponding to 2/3 of the longitudinal length of the absorbent article is a front area, and the remaining area of the absorbent article is a rear side. The absorbent article according to any one of claims 1 to 4, wherein, when a region is used, the magnitude relationship is established at least in the front region.   The absorptivity according to claim 5, wherein the adhesion area ratio of the adhesive is larger in the order of the core lateral end portions of the front region, the core lateral end portions of the rear region, and the core lateral center portion. Goods.

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